the manhunt for the software millionaire suspected of murder. Abc's matt gutman is on the case in belize. You've been learning a lot more ABOUT john McAfee's compound and how close the police may be. Reporter: That's right, george. Sources are telling us that police are focusing searching on this island. And all of the talk about McAFEE'S HIDING OUT, IT'S Possible he's in the estate behind me, hunkers down in a steel and concrete safe room. This morning, it appears that investigators may be closing in ON john McAfee. The former software tycoon being sought for questioning in a murder. McAFEE SAID RUMORS ARE RIFE OF An imminent raid. And another bizarre twist in this saga, sources tell abc NEWS, McAFEE MAY NEVER HAVE LEFT His house. He could have picked a location that's very secure, the police don't know about. Reporter: In fact, abc news HAS learned McAfee's compound features a concrete safe room. This photo obtained exclusively by abc news overnight, shows the bunker's steel gate. When we visited, the lights were on. BUT WE SAW NO SIGN of McAfee. Police have been looking for McAFEE SINCE SATURDAY NIGHT WHEN His neighbor, american greg faull, was found shot in the back of his head in his home. They actually need him to make the case. Specifically, they need him to talk. Reporter: Last year, faull had complained to authorities about McAfee's security and dogs. And while investigators have not NAMED HIM A SUSPECT, McAFEE HAS Spent the week in hiding, calling reporters to say he's not insane. I'm certainly innocent of the charges that are leveled against me in the press. Reporter: Last month, mcafee released this blog. He writes, perhaps it's a tale of paranoia, in which events are misinterpreted by an unstable mind, my mind. NOW, McAFEE TOLD US HE'S Changing out his cell phones every few hours. He's gone as far as querying an online message board to ask how long it takes the cell phone companies to triangulate a cell phone call. He told us that we are being followed. We found no evidence of that at all. It feels like it's just a matter of time. Thanks very much.

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